Answer :

[tex]18+1/7-(11+5/6)[/tex]
[tex]=18-11+1/7-5/6[/tex]
[tex]=7+(6-5*7)/42[/tex]
[tex]=7-29/42[/tex]
[tex]=6+13/42[/tex]
[tex]=6\frac{13}{42}[/tex]

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